AEG DEP 112 233440 | 32-Channel Digital Input Module

Description

Core Product Summary (Brand / Model / Key Attributes)

The AEG DEP 112 (order number 6051-042.233440) is a digital input board from the AEG Modicon programmable controller family. It provides 32 digital input channels rated for 24 VDC signals and is designed for installation on an AEG backplane within an AEG Modicon PLC rack configuration.

The module is identified on the front plate as “32 DIG I/P 24V DC PDS” and carries the full order reference 6051-042.233440. It belongs to the AEG Modicon PDS series of I/O boards, which operate alongside companion modules such as digital output boards and Bitbus receiver boards within the same rack architecture. A hardware variant of the board exists under order number 6051-042.233440.06, which is functionally positioned as a 32-input replacement board for the same backplane slot.

Key Technical Specifications

Detailed Product Overview

The DEP 112 is a 32-channel discrete input module used in AEG Modicon controller installations, a platform commonly found in European machine tool and production line automation built in the 1980s and 1990s. Each of the 32 channels accepts a 24 VDC input signal, the prevailing standard for connecting pushbuttons, limit switches, proximity sensors, relay contacts, and other binary field devices to a PLC system.

The board plugs into an AEG backplane, from which it receives its logic power and bus connection to the controller. Within the PDS rack architecture, the DEP 112 handles the input side of the I/O subsystem, while companion boards in the same family cover the output and communications functions — for example, 32-channel digital output boards and Bitbus receiver boards are documented as part of the same rack configurations. This modular structure allows input capacity to be expanded by adding boards to the rack rather than replacing the controller.

For maintenance purposes, the module exists in at least two hardware releases: the standard 6051-042.233440 board and the 6051-042.233440.06 revision, which serves as a like-for-like replacement board for the same slot and function. Both are handled in the service market as replacement boards for defective units, allowing production equipment with AEG Modicon controls to be repaired to board level rather than retrofitted.

Engineering Selection Highlights

• Exact order number match — specify 6051-042.233440 (or the .06 revision) to guarantee mechanical and bus compatibility with the existing AEG backplane; the DEP number alone is shared across several AEG Modicon input board types with different channel counts and voltage levels.
• 24 VDC input standard — all 32 channels are 24 VDC; inputs sourced from other voltage levels require interposing relays or appropriate conversion.
• Channel density — 32 inputs per board gives high density per rack slot; verify rack power budget and slot addressing when fully populated.
• Rack architecture fit — the board is designed for the AEG Modicon PDS backplane system; it cannot be used as a stand-alone input unit without the backplane, bus connection, and associated rack power.
• Board-level repair strategy — because the platform is legacy equipment, board-level replacement of a failed input module is typically the fastest route back to production; matched-revision spares reduce configuration risk.
• Companion modules — input and output sides of the same installation typically use DEP-series input boards and DAP-series output boards from the same family; source spares with matching order numbers for each slot type.

DEP 112 233440

DEP 112 233440

Dimensions, Mounting & Connection Notes

• Mounting: plugs onto the AEG backplane inside the controller rack; retained in the rack frame
• Connections: field wiring terminates at the rack’s terminal or connector system associated with the board slot; verify slot-to-terminal mapping in the machine documentation before replacing
• Identification: the front plate carries the designation “32 DIG I/P 24V DC PDS” and the order number 6051-042.233440
• Handling: as with all rack-mounted electronic boards, observe ESD precautions when removing or inserting the module, and power down the rack before board exchange

System Compatibility & Integration Requirements

FAQ

What is the AEG DEP 112 233440?
It is a 32-channel digital input board for AEG Modicon programmable controller systems, providing 32 digital inputs at 24 VDC. Its full order number is 6051-042.233440.

What does the “PDS” designation on the module mean?
It identifies the board as part of the AEG Modicon PDS series of rack-mounted I/O boards, distinguished on the front plate as “32 DIG I/P 24V DC PDS.”

How many inputs does the module provide?
32 digital inputs, all rated for 24 VDC signals.

How is the module mounted?
It is a rack-mounted board that plugs onto an AEG backplane, receiving logic power and the controller bus connection through the backplane.

Is there a replacement or variant version of this board?
Yes. Order number 6051-042.233440.06 is a 32-input board variant that serves as a like-for-like replacement in the same backplane application.

What kind of devices connect to its inputs?
Typical 24 VDC binary field devices: pushbuttons, limit switches, proximity sensors, pressure switches, and relay contacts.

Can the DEP 112 be used without the AEG backplane?
No. The board is designed to operate as part of the AEG Modicon rack system and depends on the backplane for power and bus communication.

Verification & Troubleshooting Notes

• Board not recognized after installation: confirm the board is fully seated on the backplane connectors and that the rack power is present; reseat the module with the rack powered down.
• One or more inputs stuck off: check the field device and its 24 V supply at the terminal level first; a group of failed inputs on one side of the board suggests localized input circuit damage rather than field wiring.
• Inputs reading erratically: verify the 24 VDC field supply is within tolerance and free of ripple; shared supplies with inductive loads can cause false input states.
• Suspected board failure: swap the DEP 112 with a known-good board from an unused slot (with identical order number) to separate board faults from backplane, terminal, or field-wiring faults before ordering a replacement.
• Replacement ordering: read the complete order number printed on the board label (6051-042.233440 or the .06 revision) rather than relying on the DEP 112 name alone, since several AEG Modicon input boards share similar model designations with different specifications.
• All board removal and insertion work should be performed with the rack powered down and appropriate ESD precautions observed.